Biden's vaccine rules to set off barrage of legal challenges

President Joe Biden walks along the Colonnade toward the Oval Office as he returns to the White House after visiting Brookland Middle School in northeast Washington on Friday, Sept. 10, 2021. Biden has encouraged every school district to promote vaccines, including with on-site clinics, to protect students as they return to school amid a resurgence of the coronavirus. (Manuel Balce Ceneta/Associated Press)